Camera accessory and camera system

Abstract

The present application discloses a camera accessory and camera system configured to be mounted to a camera body having a first mounting seat; the camera accessory comprises: an accessory housing; a second mounting seat, arranged at an end of the accessory housing, configured to snap-fitted to the first mounting seat; a latch structure, arranged on the second mounting seat, configured to engage with a structure on the first mounting seat to restrict rotation of the second mounting seat relative to the first mounting seat; an unlocking button, arranged on a side surface of the accessory housing, connected to the latch structure, for releasing the engagement between the latch structure and the first mounting seat. The present application provides an unlocking button on the camera accessory that allows the camera accessory to be detached while unlocking, thereby facilitating user operation.

What is claimed is: 
     
         1 . A camera accessory, wherein the camera accessory is configured to be mounted to a camera body having a first mounting seat, the first mounting seat comprising a plurality of first claws; the camera accessory comprising:
 a second mounting seat, the second mounting seat comprising a plurality of second claws; the second mounting seat being configured to rotate relative to the first mounting seat between a first state and a second state, wherein in the first state, the second claws are each inserted between the first claws; wherein in the second state, the second claws engage with the first claws;   a latch structure, wherein the latch structure is movably arranged on an outer ring surface of the second mounting seat that engages with the first claw, and when the second mounting seat rotates relative to the first mounting seat between the first state and the second state, the latch structure retracts into the outer ring surface; when the second mounting seat is in the second state relative to the first mounting seat, the latch structure projects from the outer ring surface and engages with the first claw to restrict the second mounting seat from rotating from the second state to the first state.   
     
     
         2 . The camera accessory according to  claim 1 , wherein the camera accessory further comprising:
 an accessory housing, wherein the second mounting seat is arranged at an end of the accessory housing;   an unlocking button, wherein the unlocking button is arranged on a side surface of the accessory housing, connected to the latch structure, acting upon the latch structure to cause the latch structure to retract into the outer ring surface, thereby releasing the engagement between the latch structure and the first claw.   
     
     
         3 . The camera accessory according to  claim 2 , wherein the latch structure is elastically movably arranged relative to the outer ring surface in an axial or radial direction of the camera accessory, and when the second mounting seat rotates relative to the first mounting seat between a first state and a second state, the latch structure is pressed into the outer ring surface by the first claw; when the second mounting seat is in the second state relative to the first mounting seat, the latch structure is ejected from the outer ring surface. 
     
     
         4 . The camera accessory according to  claim 3 , wherein a linkage structure is arranged between the unlocking button and the latch structure, the unlocking button being movable radially to drive the latch structure to move axially through the linkage structure. 
     
     
         5 . The camera accessory according to  claim 4 , wherein a guide portion is fixedly arranged on the second mounting seat, and an axial guide groove is provided on the guide portion; the latch structure is arranged on the guide portion and moves axially along the axial guide groove;
 the linkage structure comprising:   a V-shaped transmission member, wherein the turning point of the V-shaped transmission member is rotatably arranged on the guide portion, with one end connected to the latch structure and another end connected to the unlocking button.   
     
     
         6 . The camera accessory according to  claim 5 , wherein a return snap spring is arranged at the rotational connection between the V-shaped transmission member and the guide portion, and in the natural state of the return snap spring, the latch structure projects from the outer ring surface. 
     
     
         7 . The camera accessory according to  claim 3 , wherein the unlocking button abuts against the latch structure, the unlocking button moves radially and drives the latch structure to move radially. 
     
     
         8 . A camera accessory, wherein the camera accessory is configured to be mounted to a camera body having a first mounting seat, the camera accessory comprising:
 a second mounting seat configured to be engaged and connected with the first mounting seat;   a contact holder rotatably arranged on an inner ring surface of the second mounting seat, wherein contacts are arranged on the contact holder and configured to be electrically connected to the camera body;   a guide structure arranged between the contact holder and the second mounting seat; when the contact holder rotates relative to the second mounting seat, the contact holder moves in the axial direction of the camera accessory under an action of the guide structure.   
     
     
         9 . The camera accessory according to  claim 8 , wherein the guide structure is formed with a guide surface, the guide surface extends in the circumferential direction and is inclined in the axial direction; the contact holder abuts against the guide surface, and when the contact holder rotates relative to the second mounting seat, the guide surface generates an axial force on the contact holder to cause the contact holder to move in the axial direction. 
     
     
         10 . The camera accessory according to  claim 9 , wherein the guide structure comprises a guide post arranged on the contact holder and a guide plate arranged on the second mounting seat; the guide plate is fixed to an end surface of the second mounting seat facing away from the first mounting seat, the guide surface is formed on the guide plate, and the guide post abuts against the guide surface. 
     
     
         11 . The camera accessory according to  claim 10 , wherein the contact holder comprises a rotating ring, an elastic ring, and a holding portion, the rotating ring is rotatably engaged with an inner ring surface of the second mounting seat, the elastic ring connects the rotating ring and the holding portion, the holding portion is configured to mount contacts; the guide post is arranged on the holding portion. 
     
     
         12 . The camera accessory according to  claim 9 , wherein the guide structure comprises a guide groove and a guide post, the guide groove being formed in one of the second mounting seat and the contact holder, the guide post being arranged on the other one of the second mounting seat and the contact holder; the guide post is inserted through the guide groove, the guide surface being formed on the guide groove. 
     
     
         13 . The camera accessory according to  claim 12 , wherein the guide structure further comprises a mounting slot connected to the guide groove, during the process of the contact holder being axially mounted to the second mounting seat, the guide post enters the guide groove from the mounting slot;
 a limiting structure is arranged between the contact holder and the second mounting seat to restrict movement of the guide post within the guide groove.   
     
     
         14 . The camera accessory according to  claim 13 , wherein the limiting structure comprises a limiting hole extending circumferentially on the second mounting seat, and a limiting post arranged on the contact holder, the limiting post being inserted into the limiting hole. 
     
     
         15 . The camera accessory according to  claim 9 , wherein the guide structure comprises a guide hole formed on the second mounting seat and extending circumferentially, and a guide post arranged on the contact holder, the guide post being inserted through the guide hole, the guide surface being formed in the guide hole. 
     
     
         16 . The camera accessory according to  claim 9 , wherein the guide surface is inclined in a direction away from the first mounting seat along the mounting rotation direction of the camera accessory relative to the camera body. 
     
     
         17 . The camera accessory according to  claim 8 , wherein the first mounting seat comprises a plurality of first claws, the second mounting seat comprises a plurality of second claws, the second mounting seat rotates relative to the first mounting seat between a first state and a second state, and in the first state, the second claws are each inserted between the first claws; wherein in the second state, the second claws engage with the first claws;
 the contact holder is connected with a locking post, the locking post projecting from the outer ring surface of the second mounting seat, wherein during the process of the second mounting seat rotating from the first state to the second state relative to the first mounting seat, the first claw abuts against the locking post, thereby causing the contact holder and the first mounting seat to be relatively fixed in the circumferential direction, wherein the second mounting seat and the contact holder undergo relative rotation, whereby the contact holder is subjected an axial acting force to move axially in a direction approaching the first mounting seat, thereby achieving electrical connection with the camera body.   
     
     
         18 . The camera accessory according to  claim 17 , wherein when the second mounting seat is in a first state relative to the first mounting seat, the contact holder is in a first position relative to the second mounting seat; when the second mounting seat is in a second state relative to the first mounting seat, the contact holder undergoes positional changes in both axial and circumferential directions relative to the second mounting seat, and is in a second position;
 a return elastic member is arranged between the contact holder and the second mounting seat, whereby the contact holder can return from the second position to the first position under the action of the return elastic member.   
     
     
         19 . The camera accessory according to  claim 8 , wherein the surface of the contact holder facing the first mounting seat has a height difference, and the contacts are arranged flush with the surface having the height difference; or,
 the surface of the contact holder facing toward the first mounting seat is planar, the contacts are metal posts, with portions of the contacts projecting from the contact holder so as to form a height difference between the contacts.   
     
     
         20 . A camera system, characterized in that the camera system comprises the camera accessory according to  claim 1 , and a camera body adapted to the camera accessory.